Add more nullability annotations to module/spring-boot-cloudfoundry

See gh-46587

module/spring-boot-cloudfoundry/src/main/java/org/springframework/boot/cloudfoundry/actuate/autoconfigure/endpoint/reactive/CloudFoundryWebFluxEndpointHandlerMapping.java

@@ -148,13 +148,13 @@ class CloudFoundryWebFluxEndpointHandlerMapping extends AbstractWebFluxEndpointH
 		}
 
 		@Override
-		public Mono<ResponseEntity<Object>> handle(ServerWebExchange exchange, Map<String, String> body) {
+		public Mono<ResponseEntity<Object>> handle(ServerWebExchange exchange, @Nullable Map<String, String> body) {
 			return this.securityInterceptor.preHandle(exchange, this.endpointId.toLowerCaseString())
 				.flatMap((securityResponse) -> flatMapResponse(exchange, body, securityResponse));
 		}
 
-		private Mono<ResponseEntity<Object>> flatMapResponse(ServerWebExchange exchange, Map<String, String> body,
-				SecurityResponse securityResponse) {
+		private Mono<ResponseEntity<Object>> flatMapResponse(ServerWebExchange exchange,
+				@Nullable Map<String, String> body, SecurityResponse securityResponse) {
 			if (!securityResponse.getStatus().equals(HttpStatus.OK)) {
 				return Mono.just(new ResponseEntity<>(securityResponse.getStatus()));
 			}

module/spring-boot-cloudfoundry/src/main/java/org/springframework/boot/cloudfoundry/actuate/autoconfigure/endpoint/servlet/CloudFoundryWebEndpointServletHandlerMapping.java

@@ -156,7 +156,7 @@ class CloudFoundryWebEndpointServletHandlerMapping extends AbstractWebMvcEndpoin
 		}
 
 		@Override
-		public Object handle(HttpServletRequest request, Map<String, String> body) {
+		public @Nullable Object handle(HttpServletRequest request, @Nullable Map<String, String> body) {
 			SecurityResponse securityResponse = this.securityInterceptor.preHandle(request, this.endpointId);
 			if (!securityResponse.getStatus().equals(HttpStatus.OK)) {
 				return new ResponseEntity<Object>(securityResponse.getMessage(), securityResponse.getStatus());